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Arnold Schwarzenegger went old school on Saturday as he headed to lunch in Beverly Hills -- he wore a ring sporting the skull from the Terminator flicks.

Schwarzenegger hasn't been in a Terminator movie since 2003's Rise of the Machines, but he has plans to revive the franchise, and it looks like he's ready to ring it in.

No word yet on if Arnold is ready to terminate his 17-year-old son Patrick over a new ad campaign the teenager is in -- Patrick is featured on a huge billboard over Sunset Boulevard for Hudson Jeans ... and he's shirtless (see below)!

We don't think Arnold will like what it says underneath the ad, either! Check out our pic after the jump to see what's there!

Patrick Schwarzenegger model sexy bare chested shirtless billboard ad Arnold Schwarzenegger son Hudson Jeans Maria Shriver